<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>修改商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert
        title="修改商品信息"
        type="info"
        center
        show-icon
        :closable="false"
      ></el-alert>

      <!-- 步骤条 -->
      <el-steps
        :space="200"
        :active="activeIndex - 0"
        finish-status="success"
        align-center
      >
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <!-- tab栏区域 -->
      <el-form
        :model="editForm"
        :rules="editFormRules"
        ref="editFormRef"
        label-width="100px"
        label-position="top"
      >
        <el-tabs
          v-model="activeIndex"
          :tab-position="'left'"
          :before-leave="beforeTabLeave"
          @tab-click="tabClicked"
        >
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="editForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="editForm.goods_price"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="editForm.goods_weight"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="editForm.goods_number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">
              <el-cascader
                v-model="editForm.goods_cat"
                :options="cateList"
                :props="{
                  expandTrigger: 'hover',
                  value: 'cat_id',
                  label: 'cat_name',
                  children: 'children',
                }"
                @change="handleChange"
              ></el-cascader>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品参数" name="1">
            <!-- 渲染表单的Item项 -->
            <el-form-item
              :label="item.attr_name"
              v-for="item in manyTableData"
              :key="item.attr_id"
            >
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox
                  :label="cb"
                  v-for="(cb, i) in item.attr_vals"
                  :key="i"
                  border
                ></el-checkbox>
              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品属性" name="2">
            <el-form-item
              :label="item.attr_name"
              v-for="item in onlyTableData"
              :key="item.attr_id"
            >
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <el-tab-pane label="商品图片" name="3">
            <el-upload
              :action="updloadUrl"
              :on-preview="handlePreview"
              :on-remove="handleRemove"
              list-type="picture"
              :headers="headerObj"
              :on-success="handleSuccess"
              :file-list="pictures"
            >
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器组件 -->
            <quill-editor v-model="editForm.goods_introduce"></quill-editor>
            <!-- 编辑商品按钮 -->
            <el-button type="primary" @click="edit" class="btnedit"
              >编辑商品</el-button
            >
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>

    <!-- 图片预览 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt="" class="previewImg" />
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'

export default {
  created() {
    this.getCateList()
    this.getGood()
  },
  data() {
    return {
      // 步骤条进度
      activeIndex: '0',
      // 编辑商品的表单数据对象
      editForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品的详细描述
        goods_introduce: '',
        attrs: [],
      },
      pictures: [],
      // 编辑商品的表单数据规则
      editFormRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' },
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' },
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' },
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' },
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' },
        ],
      },
      // 商品分类列表
      cateList: [],
      // 动态参数列表
      manyTableData: [],
      // 静态属性列表
      onlyTableData: [],
      // 上传图片的url地址
      updloadUrl: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传组件的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token'),
      },
      // 图片预览路径
      previewPath: '',
      // 控制图片预览对话框的显示与隐藏
      previewVisible: false,
    }
  },
  methods: {
    // 获取所有商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类数据失败!')
      }

      this.cateList = res.data
    },
    async getGood() {
      const { data: res } = await this.$http.get(
        `goods/${this.$route.query.goodsId}`
      )
      console.log(res)
      if (res.meta.status !== 200) this.$message.error('获取商品信息失败')
      this.editForm = res.data
      this.editForm.goods_cat = [
        this.editForm.cat_one_id,
        this.editForm.cat_two_id,
        this.editForm.cat_three_id,
      ]

      // 处理图片回显
      this.editForm.pics.forEach((pic) => {
        this.pictures.push({
          name: pic.pics_mid.split('/')[pic.pics_mid.split('/').length - 1],
          url: 'http://localhost:8888/api/private/v1/' + pic.pics_mid,
        })
      })
    },
    // 级联选择器选中项变化,会触发这个函数
    handleChange() {
      if (this.editForm.goods_cat.length !== 3) {
        this.editForm.goods_cat = []
      }
    },
    // tab 进行切换时的验证
    beforeTabLeave(activeName, oldActiveName) {
      if (oldActiveName === '0' && this.editForm.goods_cat.length !== 3) {
        this.$message.error('请选择商品分类!')
        return false
      }
      return true
    },
    // tab 切换
    async tabClicked() {
      // 动态参数面板
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          { params: { sel: 'many' } }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数失败!')
        }
        res.data.forEach((item) => {
          item.attr_vals = item.attr_vals === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(
          `categories/${this.cateId}/attributes`,
          { params: { sel: 'only' } }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数失败!')
        }
        this.onlyTableData = res.data
      }
    },
    // 处理图片预览效果
    handlePreview(file) {
      this.previewPath = file.url
      this.previewVisible = true
    },
    // 处理移除图片的操作
    handleRemove(file) {
      // 获取将要删除的图片的临时路径
      var filePath = file.url
      if (file.response != null) {
        filePath = file.response.data.tmp_path
      }
      // 从 pics 数组中,找到这个图片对应的索引值
      const i = this.editForm.pics.findIndex((x) => {
        if (x.pic == null) {
          return x.pics_mid === filePath
        } else if (x.pics_mid == null) {
          return x.pic === filePath
        }
      })
      // 调用数组的 splice 方法,把图片信息对项,从 pics 数组中移除
      this.editForm.pics.splice(i, 1)
    },
    // 监听图片上传的成功的事件
    handleSuccess(response) {
      // 拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      // 将图片信息对象, push 到 pics 数组中
      this.editForm.pics.push(picInfo)
    },
    // 编辑商品
    edit() {
      this.$refs.editFormRef.validate(async (valid) => {
        if (!valid) {
          return this.$message.error('请填写必要的表单项!')
        }

        // 执行编辑的业务逻辑
        const form = _.cloneDeep(this.editForm)
        form.goods_cat = form.goods_cat.join(',')

        form.attrs = []

        // 处理动态参数
        this.manyTableData.forEach((item) => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' '),
          }
          form.attrs.push(newInfo)
        })

        // 处理静态属性
        this.onlyTableData.forEach((item) => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals,
          }
          form.attrs.push(newInfo)
        })
        // form.attrs = this.editForm.attrs

        // console.log(form)
        // 发起请求编辑商品
        // 商品的名称,必须是唯一的
        const { data: res } = await this.$http.put(
          `goods/${this.$route.query.goodsId}`,
          form
        )
        if (res.meta.status !== 200) {
          return this.$message.error('编辑商品失败')
        }

        this.$message.success('编辑商品成功')
        this.$router.push('/goods')
      })
    },
  },
  computed: {
    cateId() {
      if (this.editForm.goods_cat.length === 3) {
        return this.editForm.goods_cat[2]
      }
      return null
    },
  },
}
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}

.previewImg {
  width: 100%;
}

.btnedit {
  margin-top: 15px;
}
</style>